Water-tube boiler.



E. H. WELLS.

WATER TUBE BOILER. APPLUIGATION FILED APR. 3, 1912.

man/MM INVENTUI? Patented Dec. 9, 1913.

Q M M Zia/ I i STATES PATENT OFFICE.

EDWARD H. WELLS, 0F MONTCLAIE, NEW Il'ZlElR-SEY, ASSIGNOR TO THE BABCOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JER$EY.

. WATER-TUBE BOILER.

To all whom it may concern:

Be it known that I, EDWARD H. Wan s, a citizen of the United States, residing at Montclair in the county of Essex and State of New J ersey, have invented certain new and useful Improvements in Water-Tube Boilers, of which the following is a specification.

My invention relates to a water tube boiler, and more particularly to a design comprising two banks of inclined generating tubes, one above the other, the lower bank having its tubes exposed to the direct heat of the furnace and inclined at a difierent angle to the horizontal than the upper bank, and a 'chamber above the lower bank, at its lower end, included between the side walls, to form a chamber for the accumulation of dust which may be removed by any suitable means. p

In the accompanying drawing. which is a longitudinal section of a boiler'embodying my invention, the numeral 1 designates a bank of generating tubes inclined at about thirty degrees to the horizontal and placed directly above the combustion arches 2, so that said tubes shall be exposed to the direct heat of the furnace. .The tubes of the bank 1 are expanded into uptake and downtake headers 3 and 4, the sections of the latter being nippled to a cross-box 5, having a blow-ofl connection 6. Above the tubes 1 is a second bank of inclined generatin tubes 7 expanded into uptake and downta e headers 8 and 9. Both banks of tubes are rectangular in cross section. The bank 7 is divided by bafiles 10 and 11 into a plurality of transverse asses beginning at the uptake ends of the tubes. The bafile 10 is extended downward to the lower bank of tubes so that the gases pass upward along the lower bank of tubes to the first pass of the upper bank, then downward through the second pass and upward through the third pass to the stack 12. The headers 3 and 8 are nippled together, and the headers 4 and 9 are connected by tubes 13 the adjacent sides of which are spaced about three inches apart. The headers 8 and 9 of the upper bank are connected to a' steam and Water drum 14. A superheater 15 is located in the space above the upper bank of tubes over the first and second passes.

A longitudinal baffle 16 rests upon the upper row of tubes of the lower bank 1, and

Specification of Letters Patent.

Application filed April 3, 1912. Serial No. 688,131.

Patented Dec. 9, 1913.

A plate 16 rests against the tubes 13 to form the rear wall of the dust chamber.

The dust may be removed by any suitable means, .as for example, a screw conveyer 17 extending throu h the lower part of the chamber and delivering into ash cars; or the plate 16 and the screw conveyer 17 may be removed and the dust allowed to pass by gravity between the nipples leading downward to the lowermost rear header and be drawn out through chutes. The way in which the dust is removed is immaterial as far. as my invention is concerned, and itmight be removed by an air suction appara tus instead of a screw conveyer.

As shown by me, the entire floor space oc cupied by the boiler is available as rate area, the furnace being charged throug i the front and rear doors 18 and 19. A low division wall 20 is shown extending transversely with respect to the furnace between the grate surfaces and forming an air duct opening into both fuel chambers, the openings being controlled by dampers 21.

Inclining the lower bank of tubes in the way described allows the cross baffle 11 which separates the last two sections of the upper bank of tubes, to be extended, if so desired, all the way across the bank of tubes. The general baffle arrangement leads to most efficient results as the entire tube surfaces of the boiler are either acted on directly by the radiant heat, or by the hot furnace gases, or are subjected to a cross flow of the gases. In many forms of bailles the gases after leavingthe furnace chamber are made to flow in a parallel direction to the tube surfaces, and tests have shown that the absorption of heat with the gases flowin parallel with the tubes is considerably less t ian'when they flow across the tubes.

What I claim and desire to secure by Letters Patent of the United States is:

1. A water tube boiler having two banks of inclined generating tubes one above the other, uptake and downtake headers into which the tubes of said banks are expanded, tubes connecting the downtake headers of said banks, a lon itudinal baffle extending from the downta e headers of the lower bank, and a plate resting against said connecting tubes, said bafile and plate forming with the side walls of the setting a dust collecting chamber between the two banks of.

tubes, and means for removing the dust from said chamber. 2. A water tube boiler having two banks of inclined generating tubes one above the other, uptake and downtake headers into which the tubes of said banks are expanded, tubes connecting the downt'ake headers of said banks, a transverse bafiie extending across the tubes of the upper bank to the lower bank, a longitudinal bafile extending from the downtake headers of the lower bank to said transverse baflle, a plate restmg against said connectin tubes, said longitudlnal bafiie and plate orming with the side walls of the setting a dust collecting chamber between the two banks of tubes,

and means for removing the dust from said chamber.

3. A water tube boiler having two banks of inclined generating tubes one above the other, and the lower bank inclined at a greater degree to the horizontal than the inclination of the upper bank, uptake and downtake headers into which the tubes of said banks are expanded, tubes connecting the downtake headers of said banks, a lon gitudinal battle extending from the downtake headers of the lower bank, and a plate resting against said connectin tubes, said baflie and plate forming with t e side walls of the setting a dust collecting chamber between the two banks of tubes, and means for removing the dust from said chamber.

4:. A water tube boiler having two banks of inclined generating tubes one, above the other, uptake and 'downtake headers into which said tubes are expanded, tubes connecting the downtake headers of said banks,

a dust collecting chamber-between the two banks of tubes, and means for removing the dust from said chamber.

5. A water tube boiler havin two banks of inclined generatingtubes one above the other, uptake and downtake headers into which the tubes of said banks are expanded, said uptake headers being nippled together, tubes connecting the downtake'headers of said banks, a transverse bafiie extending across the tubes of the upper bank to the lower bank, a longitudinal baflle extending from the downtake headers of athe lower bank to said transverse bafile, a plate resting against said connecting tubes, said longitudinal bafiie and plate forming with the side walls of the setting a dust collecting chamber between the two banks of tubes, and meansfor removing the dust from said chamber.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

EDWARD H. WELLS.

Witnesses:

' KATHARINE VAN VALKENBURG,

M. W. SEWALL. 

